Centrifugal pump.



A. P. BLACKSTEAD.

GENTRIFUGAL PUMP.

APPLICATION FILED MAY 1, 1913.

Patented Sept 1, 19M

2 SHEETSSHEET 1.

g. 5 M WW A. P. BLAGKSTEAD.

OENTRIPUGAL PUMP.

APPLICATION FILED MAY1,1913,

Patented Sept. 1, 1914.

2 SHEETSSHEET 2.

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' a '4. v d K; a 14% secured to said plates by rivets,

UNITED STATEEgIlgENT curios.

ANDERS P. BLAoKsTEai), or CAMDEN, JERSEY, nss'ionon T0 oAMiJ'EN IRON WORKS, or oAMnE v, NEW JERSEY, A coaroaarlonor NEW JERSEY.

CENTRIFUG-AL PUMP.

Application filed May 1, 1913. Serial No. 764,851.

provements in Centrifugal Pumps, of which the following is a specification.

My invention relates to certain mprovements inceutrifugal pumps andv especiallythose of large dimensions and great capacity.

()ne object of' the invention is to materially lighten the casing of the pump and this is accomplished by substituting sheet metal for the cast metal casing usually em-;

ployed.

and the weight of the elements by connecti-ng the two side plates directly instead of indirectly through the casing or volute, as-

herctofore.

A still further object of the invention is to support the side plates directly by legs or extensions instead of providing the volute with supporting feet.

In the accompanying drawings: Figure 1 is a perspective view of the casing of a centrifugal pump, illustrating the side plates and the volute; Fig. 2 is a vertical sectional view on the line a-a, Fig. 3, with the suction elbows in place; Fig. 3 is a sectional view on the line bb, Fig. 2, with the suction elbows removed; Fig. 4 is a sectional view of a vertical shaft centrifugal pump, illustrating my invention; and Figs. 5 and G are views illustrating details of the invention.

Referring to the drawings, 11 are the two side plates of a centrifugal pump, made in two sections 2-2, having abutting flanges 3 which are secured together by bolts 4;.

5 is a sheet metal volute, also made in two parts in the present instance, and each part has a flange 6 connected by bolts 7 so that when it is desired to separate the casing, all that is necessary is to remove the bolts 4 and 7, after which the upper half can be raised from the lower half andthe impeller can be removed from the casing. The volute is made, in the present instance, of sheet metal side plates 8, secured to peripheral sheet metal plates 9 by angle bars 10 which are The volute may be strengthened, as desired, to resist internal pressures.

I have illustrated the casing made in two sections,-but it may be made in three or more Patented Sept.1, 1914. V

sections according to the size,-as it will be understood that centrifugal pumps of this type are very large and must be designed so that they can be readily dismantled and shipped. 7

11 is the shaft mounted in bearings 12 located on foundations independent of the casing of the centrifugal pump.- This shaft passes through stuffing boxes 13 in the suction elbows 14 secured to the side plates, as

shown. On the shaft 11 is the impeller-15, which rotates in the casing and which draws A further object of the invention is to relicve the casing, or volute, from the strains the water through the branch pipe 14 and discharges it into the volute 5 in the ordinary maner common to this type of pump. The side plates are connected to the volute by a seriesof rivets 16 and directly connecting the two side plates are bolts 17 which pass through spacing sleeves 18. The ends of the spacing sleeves bear againstthe inner surface of each side plate and when these bolts are properly adjusted the two-side plates are rigidly connected so that the strains are transmitted from one side plate to the other through the bolts and the spacing sleeves and not through the volute.

In order to properly support the side plates in the casing, I provide brackets 19 on each side plate and connect these brackets directly with the foundation 20 through legs 21, which may be made separate from the brackets and rigidly connected thereto by bolts, or they may form an integral part of the brackets, depending upon the construction of the foundation and the arrangement of the suction pipesas these pipes may be connected at any angle according to the lay ullt of the particular plant of which the centrifugal pump forms a part.

In Fig. 4, I have illustrated my invention as applied to a vertical shaft centrifugal pump in which the lower side plate has feet 22 which rest directly on the foundation and as shown. licving it of all strains due to internal pressure of the water being forced through the pump and this is accomplished by directly connecting the side plates, which are made of cast metal, in the present instance, so that the strains are carried from one side plate to the other by the connections, and, furthermore, by supporting the side plates directly on the foundations, instead of indirectly through thevolute, I am enabled to retain the parts in the proper alinement as, in many cases, where the parts are supported by the volute they are likely to sag and to draw the parts out of alinement or t e volute must be exceedingly heavy, which renders it unwieldy. In some instances, the legs 21 may be further improved by being secured to the side plates, if desired.

I claim:

1. The combination in a centrifugal pump, of two side plates, each having a central opening therein; a series of annular connections between the two side plates holding them in alinement; a volute made of sheet metal and secured .to the side plates beyond the connections and independent thereof; a shaft extending through the openings in the side plates; independent bearings for the shaft; and an impeller on the shaft located between the side plates, the impeller being less in diameter than the space inclosed by the connections of the side plates.

2. The combination in a centrifugal pump, of two side plates; means for rigidly connecting the plates together; a volute secured to the side plates outside of said connections and independent thereof; a shaft extending through the openings in the side plates; an impeller on the shaft less in diameter than the space inclosed by the connections of the side plates; independent bearings for the shaft; and legs secured to the side lates and supporting the plates and the \O ute independently of the bearings of the shaft.

3. The combination in a centrifugal pump, of two side plates, each plate being made in halves and each having a flange; a volute,

also made in halves, the partings of the volute being on the same line as the parting of the side plates, said volute being secured to the flanges of the side plates, connections extending from one side plate to the other whereby the plates are rigidly spaced apart and held independently of the connections with the volute; brackets on the lower half of each side plate; legs secured to the brackets independently of the volute and resting on a foundation so as to support the volute through the side plates; a shaft; an impeller on the shaft located between the side plates and in the space surrounded by the connections; and bearings for support ing the shaft independently of the supports for the side plates and volute.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ANDERS P. BLACKSTEAD. lVitnesses Jos. H. KLEIN, \VM. A. BARR. 

